[DVBC] Physics question

[eric zwicky]

beautiful!


Doug Bower wrote:
> Bob,
> 
> Thermal heat characteristics is probably the most misunderstood physical
> science.  People believe many "wives tales", such as using hot water in
> ice cube trays freezes faster.  As far as your water bottle situation is
> concerned, Bob used hot water and Bill used cold water.  Assuming both
> water bottles were the same non-insulated type, the same size, and both
> bicycles were traveling through cold air at the same speed the heat
> transfer rate would be the same.  The only difference in temperature of
> the water inside would be for the first few miles where Bob's hot water
> bottles would be giving its heat up to the environment.  Once Bob's
> bottles transferred their heat and became the same temperature as Bill's
> the physical laws of freezing would be the same for both Bob's and
> Bill's water bottles.  There is only one other factor that I didn't
> mention yet.  The only other factor that needs to be considered is what
> was inside the water?  Did Bob and Bill fill their water bottles from
> the same well?  The only way you can change the temperature at which
> pure water freezes is by adding chemicals.  For those of us that still
> remember 9th grade Science class, if you add chemicals such as the
> compound salt, you raise the temperature water freezes at.  So bill's
> bottles must have had some trace chemicals such as Gatorade or Cytomax.
> If this isn't the case I have one more idea...  If Bob and Bill filled
> their clean uncontaminated bottles from the same source with the only
> difference being Bob used hot water and Bill didn't the hot water tank
> or the hot water system is removing compounds from the water that the
> cold water system is allowing to pass.  A simple experiment could be
> performed to test this theory.  Fill two clean shot glasses with water,
> one using cold water and the other using hot water.  Both shot glasses
> must be filled with the same volume of water.  Place a lid upon each
> shot glass to prevent evaporation of any trapped chemicals and let them
> both sit on the counter until they reach room temperature.  Place them
> both next to each other in the freezer, check periodically to see if one
> shot glass if freezing before the other.   
> 
> Let me know hot the experiment worked, Doug
> 
>